diff options
author | Sean Christopherson <seanjc@google.com> | 2022-06-11 03:57:51 +0300 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-20 18:49:35 +0300 |
commit | 5d4283df5a0fc8299fba9443c33d219939eccc2d (patch) | |
tree | 06dbedf6745666a1f86bb32be212ad40c8084a8a /arch/x86/kvm/pmu.c | |
parent | 0f4a7185270c4879fa40b33d7e07b6ac38353b34 (diff) | |
download | linux-5d4283df5a0fc8299fba9443c33d219939eccc2d.tar.xz |
Revert "KVM: x86/pmu: Accept 0 for absent PMU MSRs when host-initiated if !enable_pmu"
Eating reads and writes to all "PMU" MSRs when there is no PMU is wildly
broken as it results in allowing accesses to _any_ MSR on Intel CPUs
as intel_is_valid_msr() returns true for all host_initiated accesses.
A revert of commit d1c88a402056 ("KVM: x86: always allow host-initiated
writes to PMU MSRs") will soon follow.
This reverts commit 8e6a58e28b34e8d247e772159b8fa8f6bae39192.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220611005755.753273-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.c')
-rw-r--r-- | arch/x86/kvm/pmu.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 6a32092460d3..87483e503c46 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -442,19 +442,11 @@ static void kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr) int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) { - if (msr_info->host_initiated && !vcpu->kvm->arch.enable_pmu) { - msr_info->data = 0; - return 0; - } - return static_call(kvm_x86_pmu_get_msr)(vcpu, msr_info); } int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) { - if (msr_info->host_initiated && !vcpu->kvm->arch.enable_pmu) - return !!msr_info->data; - kvm_pmu_mark_pmc_in_use(vcpu, msr_info->index); return static_call(kvm_x86_pmu_set_msr)(vcpu, msr_info); } |